pdf搜索

src/views/common/DocumentSearch.vue

@@ -515,7 +515,16 @@ export default {
             try {
                 while (this.renderQueue.length) {
                     const pageNumber = this.renderQueue.shift()
-                    await new Promise((resolve) => requestAnimationFrame(resolve))
+                    // 使用 requestIdleCallback 优化性能，在浏览器空闲时渲染
+                    if (typeof window.requestIdleCallback === 'function') {
+                        await new Promise((resolve) => {
+                            window.requestIdleCallback(() => {
+                                requestAnimationFrame(resolve)
+                            }, { timeout: 100 })
+                        })
+                    } else {
+                        await new Promise((resolve) => requestAnimationFrame(resolve))
+                    }
                     await this.renderSinglePage(pageNumber)
                 }
             } finally {
@@ -551,9 +560,11 @@ export default {
                     const schedule = () => {
                         this.prefetchScheduled = true
                         if (typeof window.requestIdleCallback === 'function') {
-                            this.prefetchHandle = window.requestIdleCallback(fetchNext, { timeout: 1000 })
+                            // 增加超时时间，减少对滚动的影响
+                            this.prefetchHandle = window.requestIdleCallback(fetchNext, { timeout: 2000 })
                         } else {
-                            this.prefetchHandle = window.setTimeout(fetchNext, 80)
+                            // 增加延迟，减少对滚动的影响
+                            this.prefetchHandle = window.setTimeout(fetchNext, 150)
                         }
                     }
                     schedule()
@@ -565,10 +576,10 @@ export default {
             this.isPrefetching = true
             if (typeof window.requestIdleCallback === 'function') {
                 this.prefetchScheduled = true
-                this.prefetchHandle = window.requestIdleCallback(fetchNext, { timeout: 800 })
+                this.prefetchHandle = window.requestIdleCallback(fetchNext, { timeout: 1500 })
             } else {
                 this.prefetchScheduled = true
-                this.prefetchHandle = window.setTimeout(fetchNext, 120)
+                this.prefetchHandle = window.setTimeout(fetchNext, 200)
             }
         },
 
@@ -1211,11 +1222,19 @@ export default {
 
             const options = {
                 root: this.$refs.pdfWrapper,
-                rootMargin: '120px 0px',
-                threshold: 0.01,
+                rootMargin: '200px 0px', // 增加预加载范围，减少滚动时的加载延迟
+                threshold: [0, 0.1, 0.5, 1], // 使用多个阈值，更精确地检测可见性
             }
 
-            this.observer = new IntersectionObserver((entries) => {
+            // 使用 requestAnimationFrame 批量处理 IntersectionObserver 回调，提升性能
+            let rafScheduled = false
+            const pendingEntries = []
+            
+            const processEntries = () => {
+                rafScheduled = false
+                const entries = [...pendingEntries]
+                pendingEntries.length = 0
+                
                 entries.forEach((entry) => {
                     if (entry.isIntersecting) {
                         const page = Number(entry.target.dataset.page)
@@ -1235,6 +1254,14 @@ export default {
                         }
                     }
                 })
+            }
+            
+            this.observer = new IntersectionObserver((entries) => {
+                pendingEntries.push(...entries)
+                if (!rafScheduled) {
+                    rafScheduled = true
+                    requestAnimationFrame(processEntries)
+                }
             }, options)
 
             this.pageContainers.forEach((container) => this.observer.observe(container))
@@ -1597,6 +1624,8 @@ export default {
     scrollbar-gutter: stable both-edges;
     -webkit-overflow-scrolling: touch;
     overflow-x: auto;
+    /* 性能优化 */
+    will-change: scroll-position;
 }
 
 .pdf-page {
@@ -1697,6 +1726,10 @@ export default {
 .pdf-canvas {
     display: block;
     margin: 0 auto;
+    /* 性能优化 */
+    image-rendering: -webkit-optimize-contrast;
+    image-rendering: crisp-edges;
+    will-change: contents;
 }
 
 .textLayer {
@@ -1708,6 +1741,8 @@ export default {
     pointer-events: auto;
     user-select: text;
     -webkit-user-select: text;
+    /* 性能优化 */
+    will-change: contents;
 }
 
 .textLayer>span {